diff --git a/nova/tests/unit/virt/libvirt/fake_libvirt_utils.py b/nova/tests/unit/virt/libvirt/fake_libvirt_utils.py
index 7345c285435..181f7aa569d 100644
--- a/nova/tests/unit/virt/libvirt/fake_libvirt_utils.py
+++ b/nova/tests/unit/virt/libvirt/fake_libvirt_utils.py
@@ -151,9 +151,8 @@ def fetch_raw_image(context, target, image_id, max_size=0):
     pass
 
 
-def get_instance_path(instance, forceold=False, relative=False):
-    return libvirt_utils.get_instance_path(instance, forceold=forceold,
-                                           relative=relative)
+def get_instance_path(instance, relative=False):
+    return libvirt_utils.get_instance_path(instance, relative=relative)
 
 
 def get_instance_path_at_destination(instance, migrate_data=None):
diff --git a/nova/tests/unit/virt/libvirt/test_driver.py b/nova/tests/unit/virt/libvirt/test_driver.py
index 66d938a62fd..3fc2cc0f8b0 100644
--- a/nova/tests/unit/virt/libvirt/test_driver.py
+++ b/nova/tests/unit/virt/libvirt/test_driver.py
@@ -16076,7 +16076,7 @@ def test_cleanup_resize_same_host(self):
             mock_get_path.return_value = '/fake/inst'
 
             drvr._cleanup_resize(ins_ref, _fake_network_info(self, 1))
-            mock_get_path.assert_called_once_with(ins_ref, forceold=True)
+            mock_get_path.assert_called_once_with(ins_ref)
             mock_exec.assert_called_once_with('rm', '-rf', '/fake/inst_resize',
                                               delay_on_retry=True, attempts=5)
 
@@ -16103,7 +16103,7 @@ def test_cleanup_resize_not_same_host(self):
             mock_get_path.return_value = '/fake/inst'
 
             drvr._cleanup_resize(ins_ref, fake_net)
-            mock_get_path.assert_called_once_with(ins_ref, forceold=True)
+            mock_get_path.assert_called_once_with(ins_ref)
             mock_exec.assert_called_once_with('rm', '-rf', '/fake/inst_resize',
                                               delay_on_retry=True, attempts=5)
             mock_undef.assert_called_once_with(ins_ref)
@@ -16127,7 +16127,7 @@ def test_cleanup_resize_snap_backend(self):
             mock_get_path.return_value = '/fake/inst'
 
             drvr._cleanup_resize(ins_ref, _fake_network_info(self, 1))
-            mock_get_path.assert_called_once_with(ins_ref, forceold=True)
+            mock_get_path.assert_called_once_with(ins_ref)
             mock_exec.assert_called_once_with('rm', '-rf', '/fake/inst_resize',
                                               delay_on_retry=True, attempts=5)
             mock_remove.assert_called_once_with(
@@ -16151,7 +16151,7 @@ def test_cleanup_resize_snap_backend_image_does_not_exist(self):
             mock_get_path.return_value = '/fake/inst'
 
             drvr._cleanup_resize(ins_ref, _fake_network_info(self, 1))
-            mock_get_path.assert_called_once_with(ins_ref, forceold=True)
+            mock_get_path.assert_called_once_with(ins_ref)
             mock_exec.assert_called_once_with('rm', '-rf', '/fake/inst_resize',
                                               delay_on_retry=True, attempts=5)
             self.assertFalse(mock_remove.called)
diff --git a/nova/tests/unit/virt/libvirt/test_imagebackend.py b/nova/tests/unit/virt/libvirt/test_imagebackend.py
index 4d8527ef767..ee649df2882 100644
--- a/nova/tests/unit/virt/libvirt/test_imagebackend.py
+++ b/nova/tests/unit/virt/libvirt/test_imagebackend.py
@@ -77,8 +77,6 @@ def setUp(self):
         self.TEMPLATE = 'template'
         self.CONTEXT = context.get_admin_context()
 
-        self.OLD_STYLE_INSTANCE_PATH = \
-            fake_libvirt_utils.get_instance_path(self.INSTANCE, forceold=True)
         self.PATH = os.path.join(
             fake_libvirt_utils.get_instance_path(self.INSTANCE), self.NAME)
 
@@ -215,8 +213,6 @@ def prepare_mocks(self):
 
     def test_cache(self):
         self.mox.StubOutWithMock(os.path, 'exists')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.TEMPLATE_DIR).AndReturn(False)
         os.path.exists(self.PATH).AndReturn(False)
         os.path.exists(self.TEMPLATE_PATH).AndReturn(False)
@@ -234,8 +230,6 @@ def test_cache(self):
 
     def test_cache_image_exists(self):
         self.mox.StubOutWithMock(os.path, 'exists')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.TEMPLATE_DIR).AndReturn(True)
         os.path.exists(self.PATH).AndReturn(True)
         os.path.exists(self.TEMPLATE_PATH).AndReturn(True)
@@ -248,8 +242,6 @@ def test_cache_image_exists(self):
 
     def test_cache_base_dir_exists(self):
         self.mox.StubOutWithMock(os.path, 'exists')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.TEMPLATE_DIR).AndReturn(True)
         os.path.exists(self.PATH).AndReturn(False)
         os.path.exists(self.TEMPLATE_PATH).AndReturn(False)
@@ -266,8 +258,6 @@ def test_cache_base_dir_exists(self):
 
     def test_cache_template_exists(self):
         self.mox.StubOutWithMock(os.path, 'exists')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.TEMPLATE_DIR).AndReturn(True)
         os.path.exists(self.PATH).AndReturn(False)
         os.path.exists(self.TEMPLATE_PATH).AndReturn(True)
@@ -371,8 +361,6 @@ def prepare_mocks(self):
 
     def test_cache(self):
         self.mox.StubOutWithMock(os.path, 'exists')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.DISK_INFO_PATH).AndReturn(False)
         os.path.exists(CONF.instances_path).AndReturn(True)
         os.path.exists(self.TEMPLATE_DIR).AndReturn(False)
@@ -391,8 +379,6 @@ def test_cache(self):
 
     def test_cache_image_exists(self):
         self.mox.StubOutWithMock(os.path, 'exists')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.DISK_INFO_PATH).AndReturn(False)
         os.path.exists(self.INSTANCES_PATH).AndReturn(True)
         os.path.exists(self.TEMPLATE_DIR).AndReturn(True)
@@ -407,8 +393,6 @@ def test_cache_image_exists(self):
 
     def test_cache_base_dir_exists(self):
         self.mox.StubOutWithMock(os.path, 'exists')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.DISK_INFO_PATH).AndReturn(False)
         os.path.exists(self.INSTANCES_PATH).AndReturn(True)
         os.path.exists(self.TEMPLATE_DIR).AndReturn(True)
@@ -426,8 +410,6 @@ def test_cache_base_dir_exists(self):
 
     def test_cache_template_exists(self):
         self.mox.StubOutWithMock(os.path, 'exists')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.DISK_INFO_PATH).AndReturn(False)
         os.path.exists(self.INSTANCES_PATH).AndReturn(True)
         os.path.exists(self.TEMPLATE_DIR).AndReturn(True)
@@ -459,8 +441,6 @@ def test_create_image_with_size(self):
         self.mox.StubOutWithMock(os.path, 'exists')
         self.mox.StubOutWithMock(imagebackend.Image,
                                  'verify_base_size')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.DISK_INFO_PATH).AndReturn(False)
         os.path.exists(self.INSTANCES_PATH).AndReturn(True)
         os.path.exists(self.TEMPLATE_PATH).AndReturn(False)
@@ -482,8 +462,6 @@ def test_create_image_too_small(self):
         fn = self.prepare_mocks()
         self.mox.StubOutWithMock(os.path, 'exists')
         self.mox.StubOutWithMock(imagebackend.Qcow2, 'get_disk_size')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.DISK_INFO_PATH).AndReturn(False)
         os.path.exists(self.INSTANCES_PATH).AndReturn(True)
         os.path.exists(self.TEMPLATE_PATH).AndReturn(True)
@@ -504,8 +482,6 @@ def test_generate_resized_backing_files(self):
                                  'get_disk_backing_file')
         self.mox.StubOutWithMock(imagebackend.Image,
                                  'verify_base_size')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.DISK_INFO_PATH).AndReturn(False)
         os.path.exists(CONF.instances_path).AndReturn(True)
         os.path.exists(self.TEMPLATE_PATH).AndReturn(False)
@@ -537,8 +513,6 @@ def test_qcow2_exists_and_has_no_backing_file(self):
                                  'get_disk_backing_file')
         self.mox.StubOutWithMock(imagebackend.Image,
                                  'verify_base_size')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.DISK_INFO_PATH).AndReturn(False)
         os.path.exists(self.INSTANCES_PATH).AndReturn(True)
 
@@ -581,7 +555,6 @@ def setUp(self):
         self.flags(enabled=False, group='ephemeral_storage_encryption')
         self.INSTANCE['ephemeral_key_uuid'] = None
         self.LV = '%s_%s' % (self.INSTANCE['uuid'], self.NAME)
-        self.OLD_STYLE_INSTANCE_PATH = None
         self.PATH = os.path.join('/dev', self.VG, self.LV)
         self.disk = imagebackend.disk
         self.utils = imagebackend.utils
@@ -647,8 +620,6 @@ def _create_image_resize(self, sparse):
 
     def test_cache(self):
         self.mox.StubOutWithMock(os.path, 'exists')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.TEMPLATE_DIR).AndReturn(False)
         os.path.exists(self.PATH).AndReturn(False)
         os.path.exists(self.TEMPLATE_PATH).AndReturn(False)
@@ -667,8 +638,6 @@ def test_cache(self):
 
     def test_cache_image_exists(self):
         self.mox.StubOutWithMock(os.path, 'exists')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.TEMPLATE_DIR).AndReturn(True)
         os.path.exists(self.PATH).AndReturn(True)
         os.path.exists(self.TEMPLATE_PATH).AndReturn(True)
@@ -681,8 +650,6 @@ def test_cache_image_exists(self):
 
     def test_cache_base_dir_exists(self):
         self.mox.StubOutWithMock(os.path, 'exists')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.TEMPLATE_DIR).AndReturn(True)
         os.path.exists(self.PATH).AndReturn(False)
         os.path.exists(self.TEMPLATE_PATH).AndReturn(False)
@@ -793,7 +760,6 @@ def setUp(self):
                    group='key_manager')
         self.flags(images_volume_group=self.VG, group='libvirt')
         self.LV = '%s_%s' % (self.INSTANCE['uuid'], self.NAME)
-        self.OLD_STYLE_INSTANCE_PATH = None
         self.LV_PATH = os.path.join('/dev', self.VG, self.LV)
         self.PATH = os.path.join('/dev/mapper',
             imagebackend.dmcrypt.volume_name(self.LV))
@@ -1592,8 +1558,6 @@ def prepare_mocks(self):
 
     def test_cache(self):
         self.mox.StubOutWithMock(os.path, 'exists')
-        if self.OLD_STYLE_INSTANCE_PATH:
-            os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
         os.path.exists(self.TEMPLATE_DIR).AndReturn(False)
         os.path.exists(self.PATH).AndReturn(False)
         os.path.exists(self.TEMPLATE_PATH).AndReturn(False)
diff --git a/nova/virt/libvirt/driver.py b/nova/virt/libvirt/driver.py
index 8d01350cf17..7f4137c7256 100644
--- a/nova/virt/libvirt/driver.py
+++ b/nova/virt/libvirt/driver.py
@@ -1114,14 +1114,7 @@ def get_volume_connector(self, instance):
             host=CONF.host)
 
     def _cleanup_resize(self, instance, network_info):
-        # NOTE(wangpan): we get the pre-grizzly instance path firstly,
-        #                so the backup dir of pre-grizzly instance can
-        #                be deleted correctly with grizzly or later nova.
-        pre_grizzly_name = libvirt_utils.get_instance_path(instance,
-                                                           forceold=True)
-        target = pre_grizzly_name + '_resize'
-        if not os.path.exists(target):
-            target = libvirt_utils.get_instance_path(instance) + '_resize'
+        target = libvirt_utils.get_instance_path(instance) + '_resize'
 
         if os.path.exists(target):
             # Deletion can fail over NFS, so retry the deletion as required.
diff --git a/nova/virt/libvirt/utils.py b/nova/virt/libvirt/utils.py
index bb891e9bab2..ff4781cd114 100644
--- a/nova/virt/libvirt/utils.py
+++ b/nova/virt/libvirt/utils.py
@@ -429,25 +429,16 @@ def fetch_raw_image(context, target, image_id):
     images.fetch(context, image_id, target)
 
 
-def get_instance_path(instance, forceold=False, relative=False):
+def get_instance_path(instance, relative=False):
     """Determine the correct path for instance storage.
 
-    This method determines the directory name for instance storage, while
-    handling the fact that we changed the naming style to something more
-    unique in the grizzly release.
+    This method determines the directory name for instance storage.
 
     :param instance: the instance we want a path for
-    :param forceold: force the use of the pre-grizzly format
     :param relative: if True, just the relative path is returned
 
     :returns: a path to store information about that instance
     """
-    pre_grizzly_name = os.path.join(CONF.instances_path, instance.name)
-    if forceold or os.path.exists(pre_grizzly_name):
-        if relative:
-            return instance.name
-        return pre_grizzly_name
-
     if relative:
         return instance.uuid
     return os.path.join(CONF.instances_path, instance.uuid)
diff --git a/releasenotes/notes/instance-path-2efca507456d8a70.yaml b/releasenotes/notes/instance-path-2efca507456d8a70.yaml
new file mode 100644
index 00000000000..c7603bf0bf7
--- /dev/null
+++ b/releasenotes/notes/instance-path-2efca507456d8a70.yaml
@@ -0,0 +1,11 @@
+---
+upgrade:
+  - Prior to Grizzly release default instance directory names were based on
+    instance.id field, for example directory for instance could be named
+    ``instance-00000008``. In Grizzly this mechanism was changed,
+    instance.uuid is used as an instance directory name, e.g. path to instance:
+    ``/opt/stack/data/nova/instances/34198248-5541-4d52-a0b4-a6635a7802dd/``.
+    In Newton backward compatibility is dropped. For instances that haven't
+    been restarted since Folsom and earlier maintanance should be scheduled
+    before upgrade(stop, rename directory to instance.uuid, then start) so Nova
+    will start using new paths for instances.